JPS61193199A - Image display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides a method for primary reading (C) of data stored in a memory.
The present invention relates to an image display device for displaying on RT, and particularly to an image display device suitable for synthesizing graphic information and coloring information to obtain a display screen.

[Background of the invention]

There are two types of image coloring methods: a block coloring method in which coloring is performed in units of color blocks made up of several vertical and horizontal pixels, and a dot coloring method in which coloring information is provided for each pixel. The block coloring method has the advantage of being able to reduce the amount of image information to be stored, and pattern-based teletext receivers and CA
Used in PTAIN receivers. Incidentally, related devices of this type include, for example, Japanese Patent Application Laid-open No. 55-1635.
Publication No. 84 is mentioned. The latter dot coloring method has the advantage of being able to specify a color at a rate of one pixel, allowing detailed display, and is widely used in personal computers and the like, and is already well known. If it is compatible with both the dot coloring method and the professional coloring method, fine-grained display will be possible, and images of CAPTAIN and teletext can also be displayed.

An example of a conventional dot coloring type imaging device is shown in FIG.

In FIG. 2, 2 is an image memory, and 5 is a D/A converter that reads digital image data from the image memory and converts it into analog data. I! Since the conventional example shown in FIG. 2 is already known, a detailed explanation of its operation will be omitted. The display memory 2 has three primary colors (R, G.

By reading out this data and displaying it on a CRT, it is possible to color each dot in units of dots. When using this dot layer color image display device to display CAPTAIN using the block coloring method, there was a problem in displaying 7 lashings and concealing when the number of characters was displayed at full power. For information on teletext, please refer to Official Gazette No. 82
The detailed explanation is omitted as shown in the Ministry of Posts and Telecommunications Ordinance No. 70 and the Ministry of Posts and Telecommunications Notification No. 863. Color information for teletext includes a foreground color (CPG color) and a background color (80 colors). Furthermore, there is blinking information and concealment information that specifies blinking designation and sealing. Hereinafter, this color information, blinking information, and concealment information will be collectively referred to as colored information.

In particular, when blinking processing and concealment processing are performed on a nine-dot coloring system screen display device as shown in Figures t-1 and 2, the CPU must rewrite the coloring information on the screen of critical blocks designated as flushing at the blinking cycle. If the number of blocks following this flickering designation increases, the cpv memory rewriting process will increase, resulting in a decrease in the cpU processing speed. Also, in the blinking process, cptt changes the color data one pixel at a time, so if the CPU processing speed slows down, there is a drawback in terms of display, such as the timing of the blinking being shifted depending on the location on the screen. Color of pixels displayed on the screen 2 cp
As a technique for rewriting without imposing the burden of v, for example, as shown in Japanese Patent Publication No. 54-57945, a color conversion memory that stores color data for coloring pixels in addition to a display memory that stores display data is used. There is one that specifies color data to be output from a color conversion memory using image data read from a display memory. According to this technique, the color of the pixels displayed on the CRT can be changed simply by changing the color data stored in the color conversion memory, and the total load on the CPU can be greatly reduced. However, this technology does not recognize cases where blinking is specified in block units, such as in teletext broadcasts. For example, when displaying red data on a CRT, if there is a mixture of unchanging red and flickering red on the CRT, or pixels that turn red after manual input due to concealment specification, the conventional technology depends on the position of the point. Color conversion memo IJ'
There was a problem in that all red dots on the CRT changed when rewriting t-.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to correct the above-mentioned drawbacks and provide an image display device (IGCT) which is capable of not only dot color display but also block color display.

[Summary of the invention]

To achieve the above object, the present invention provides an image display device that includes a display memory that stores pixel information and a color conversion memory that inputs pixel information as an address and outputs color information, and that receives all received coloring information. Add the coloring information memo IJ-i to be stored without duplication in order, and store the received nine-layer color information in the coloring information memory without duplication, and memorize the coloring information 72:Il
The present invention is characterized in that it has a conversion process for outputting position a as pixel information, and a setting process for reading out color information indicated by coloring information from a nine-color conversion memory based on the pixel information.

[Embodiment of the Invention] Hereinafter, one embodiment of the present invention will be described using one side. 1st
The figure is a configuration diagram showing an embodiment of the present invention. In FIG. 1, 1 is a central processing unit (hereinafter abbreviated as CPU), 31
2 is a demodulator that reproduces teletext data from a video signal;
1 is a color counter that counts the number of coloring information stored in the coloring information memory 21; 22 is a coloring information memory that stores 16 pieces of coloring information of teletext data in the order in which they are sent;
3 is a display memory in which 4 pixels are assigned to each pixel as pixel information, and 5 is a digital display memory that converts digital color information output from the color conversion circuit 7 into an analog color signal.
/AF & al a y converter, 8 can store 16 color information and read out from display memory 4b*
a color conversion memory that outputs color information specified by the pixel information of t; 9 a timing generation circuit that generates an address and timing for reading pixel information from the display memory 6; 1;
0 is during the period when the display memory 6 is accessed from the CPU.
This switching circuit outputs the address 12 from the CPU, and outputs the display address output from the timing generation circuit 9 during a period when pixel information is read from the display memory.

The operation of the embodiment shown in FIG. 1 will be explained in detail below using the fourth column, the fifth column, and the first table.

FIG. 4 shows the flow of how the CPU 1 processes coloring information of teletext. As described above, the coloring information is information that is a combination of color information that specifies the color to be displayed and attribute information that specifies the display form, such as blinking display or concealed display.

In FIG. 4, tLata is the received coloring information, C is the count value of the color counter 21 and the number of information stored in the coloring information memory 22, m5m22! Pl is the S-th coloring information of the coloring information memory 21, ysg island 84g) is the X-th color information of the color conversion memory, N is pixel information to be written to the display memory 3, and A is for checking the coloring information memory 22. Each shows the count value to be used. Coloring information
Upon receiving Latα, cpttl first stores the coloring information memory 22 from the first coloring information mg11L22(1).
Examine the latest coloring information up to mmJC1.

Received coloring information tLata and Atr-th coloring information ma
If n22 (, 41) match, the process proceeds to the YES direction on the right side of the flowchart, and the pixel information to be written to the display memory 3!V
'Set to IcAO value. On the other hand, if no matching image height information is found, the value of A exceeds the value C of the color counter 21, so the process proceeds to the left of the flow □□□. In this case, first, the value C of the color counter 21 is increased by one. Next, the received coloring information tLata is stored in the coloring information memory 22 as the C-th coloring information. (mam22fl←cLa
tα] Color information c included in the received coloring information ctatα
olor is written into the color conversion memory 8 as the C-th color information. (mayph 8 (C1←color). Then, set the value of the pixel information N″frC to be written to the display memory. coloring information
It performs a conversion process for converting tatα into pixel information N to be written into the display memory 3, and a setting process for storing new coloring information in the coloring information memory 22 and color information in the color conversion memory.

Next, how the received coloring information is processed and displayed within the embodiment of FIG. 1 will be explained using FIG. 5. FIG. 5 shows the flow of coloring information. Fifth
3 is a display memory, 8 is a color conversion memory, 5 is a l)/A converter, and 22 is a coloring information memory, which are functionally the same as those shown in FIG. It is attached. 101 is the applied coloring information, 102
is pixel information converted from the coloring information 101 according to coloring information processing using the coloring information memory, 103 is pixel information sequentially read out from the display memory 3, 105 is color information specified by the pixel information 103, and 104 is coloring information The desired color information is written into the color conversion memory according to the process. The received coloring information 101 is written into the display memory 3 according to coloring information processing as pixel information 1.
02 and pixel information 1! The color information 104 is read out from the color conversion memory 8 with the value l#102.
is written into the color conversion memory 8. Therefore display memory 3
If the pixel information 103 read from the pixel information 102 has the same value as the pixel information 102, the color information 105 having the same value as the color information 104 will be read from the color conversion memory 8. As a result, the color specified by the coloring information is displayed on the CRT.

The operation of the embodiment shown in FIGS. 1, 4, and 5 will be explained in more detail using specific operation examples. In the table, the apparatus of the embodiment shown in FIG.

It shows the changes in the data of each part when receiving coloring information such as "red", "blinking blue and yellow", and "". State 1 is the initial state. State 2 is the coloring information "#". “
has been received, and "blue" has been added to the third rank in the coloring information memory 22 and color conversion memory 8. Condition 5
is the state in which "1" has been received, and ``za'' is added to the 411th rank. In state 11i4, the coloring information "blue blinking red" has been received. In this state, the coloring information memory 22
Coloring information of "blue flickering red" is added to the fifth rank, and color information of "blue" and "red" are periodically written alternately in the one-color conversion memory by a changing process. If) CB
Blue and red blinking is displayed on r4. In state 5, “
Since the coloring information "red" already exists in the coloring information memory 22, no new coloring information or color information is added, and the pixel information also has the value of the stored rank "'4" of "red". .

In the example shown here, only up to the fifth content of the color information memory 22 and color conversion memory 8 are shown in the table, but m1
In this embodiment, up to 16 types of coloring information and color information can be stored.

Table 2 also includes the foreground color (F) as pixel information.
Although only the G color is shown, the background color can also be processed in the same way.

As described above, in the conventional device, color information or a color designation number that designates a color is set as the pixel information written in the display memory 3, so it is not possible to distinguish whether a pixel blinks or not just from the pixel information. In order to perform the blinking process, it was necessary to rewrite the contents of the display memory. On the other hand, according to the non-embodiment, colored information, which is rich in blinking information, is stored in the colored information memory 21 and checked, so even if the color information is the same, if the blinking information is different, it will be converted into different pixel information. That will happen. Therefore, pixels having different F)'sr color information can be distinguished by the pixel information stored in the display memory 3. As a result, the coloring information memory 22
The blinking process can be executed by rewriting the contents of the corresponding color conversion memory based on the blinking information of the color return information stored in the memory.

Similarly, concealment processing can be performed by manually rewriting the color conversion memory corresponding to the coloring information designated for concealment.

As described above, according to the non-embodiment, dot coloring is possible, and coloring information including blinking information and concealing information is stored in the coloring information memory 21, so pixels with different coloring information can be distinguished, and block coloring is possible. Teletext ii! Even if there is a flickering, designation, or concealment designation for jg1, there is an effect that it can be displayed on the CRT with less CPU load.

In the embodiment described above, a teletext image was displayed, but
F) By including multiple pieces of flashing information, concealment information, and information specifying other display formats in the coloring information.
It can be applied to image display devices that perform block coloring, such as CAPTAIN receivers. Furthermore, although the number of visible colors was limited to 16, the number of colors can be increased (by increasing the number of bits of pixel information, the number of coloring information memories, and the number of color conversion memories).

In this example, it is assumed that color information is included in the received coloring information, but even if a number specifying a color is included instead of color information, such as at the end of CAPTAINp, processing is performed as shown in Figure 6. The present invention can be applied by doing so. In FIG. 6, parts having the same functions as those in FIG. 5 are given the same numbers, and detailed operations will be omitted. Reference numeral 106 indicates a color specification number included in the coloring information, and 23 is a 1I20 color conversion memory which outputs color information 104 specified by the color specification number 106. The same effect as in the previously described embodiment can also be obtained by writing the color information 104 corresponding to the color designation number 106 included in the coloring information 101 into the color conversion memory 8 as shown in FIG.

Further, in the embodiment shown in FIG. 1, the program memory, coloring information memory 22, and color counter 21 of the CPU 1 are provided separately, but it goes without saying that the present invention can be applied even if these are configured within the program memory of the CPU 1. Nor.

[Effects of the Invention] As described above, according to the present invention, there is an effect that not only dot coloring display is possible, but also block coloring can be supported.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIGS. 2 and 3 are block diagrams showing an example of a conventional device, and the fourth leg is the first leg.
5 is a diagram showing the flow of information in the embodiment of FIG. 1, and FIG. 6 is a diagram showing the flow of information in another embodiment of the present invention. be. 109, CPU S...Display memory 8.
...Color conversion memory 21...Color counter 22...
-Coloring information memory 101...Coloring information 102.103
... Pixel information 104, 105 - ... Color information 106
...Color designation number $ 2 Figure $ 3 Item 4 Item 5 $ 6 Figure

Claims (1)

[Claims] 1. A central processing means, a first storage means for storing image information in which a plurality of bits of pixel information are assigned to each pixel, and pixel information read out sequentially from the first storage means. The second input inputs the address designation and outputs the color information to be displayed.
an image display device comprising a storage means, a conversion means for converting coloring information into the pixel information, which has a pair of color specification means for specifying color information to be displayed and blinking specification information for specifying blinking of the displayed color; Setting means for setting the second storage means so that color information specified by the color designation information before being converted to the pixel information is output from the second storage means according to the converted pixel information. An image display device comprising: 2. The image display device according to claim 1, wherein the conversion means outputs a code that corresponds one-to-one to the coloring information as the pixel information. 3. The image display device according to claim 1, further comprising a changing means for changing the color information stored in the second storage means according to the blinking specifying means.